package org.domon.manager.sys.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.domon.manager.base.handler.BaseController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;

@Controller
public class KaptchaController extends BaseController {

	@Autowired
	public DefaultKaptcha captchaProducer;

	@RequestMapping("/captcha")
	public void captcha(HttpSession session, HttpServletResponse response) {

		response.setDateHeader("Expires", 0);
		// Set standard HTTP/1.1 no-cache headers.
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		// Set standard HTTP/1.0 no-cache header.
		response.setHeader("Pragma", "no-cache");
		// return a jpeg
		response.setContentType("image/jpeg");
		// create the text for the image
		String capText = captchaProducer.createText();
		// store the text in the session
		session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

		ServletOutputStream out = null;
		try {
			// create the image with the text
			BufferedImage bi = captchaProducer.createImage(capText);
			out = response.getOutputStream();
			// write the data out
			ImageIO.write(bi, "jpg", out);
			out.flush();
		} catch (IOException e) {
			logger.error("生成验证码异常", e);
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					logger.error("关闭生成验证码的输出流异常", e);
				}
			}
		}
	}
}
